The benefits of using a permanent magnet motor with a frequency converter mainly include the following aspects:
1. Play a great energy-saving effect:
The speed of the permanent magnet motor can be adjusted with a frequency converter, which can achieve an operating effect without doing much work.
2. Overvoltage protection:
The output of the frequency converter has a voltage detection function, and the frequency converter can automatically adjust the output voltage so that the motor does not withstand overvoltage. Even when the output voltage adjustment fails and the output voltage exceeds 110% of the normal voltage, the inverter will protect the motor by shutting down.
3. Under voltage protection:
When the voltage of the motor is lower than 90% of the normal voltage, the inverter will shut down for protection.
4. Overcurrent protection:
When the motor's current exceeds 150% of the rated value for 3 seconds, or 200% of the rated current for 10 microseconds, the inverter protects the motor by shutting down.
5. Phase loss protection:
Monitor the output voltage. When the output phase is missing, the inverter will alarm. After a period of time, the inverter will stop to protect the motor.
6. Reverse phase protection:
The inverter can be set so that the motor can only rotate in one direction, but the direction of rotation cannot be set. Unless the user changes the phase sequence of the motor A, B, and C connections, there is no possibility of phase reversal.
7. Overload protection:
The frequency converter monitors the motor current. When the motor current exceeds 120% of the rated current/1 minute, the frequency converter protects the motor by shutting down.
8. Ground protection:
The frequency converter is equipped with a special grounding protection circuit, which is generally composed of a grounding protection transformer and a relay. When one or two phases are grounded, the frequency converter will alarm. Of course, if the user requires it, we can also design it to protect and shut down after grounding.
9. Short circuit protection:
After the inverter output is short-circuited, it will inevitably cause overcurrent, and the inverter will stop to protect the motor within 10 microseconds.
10. Overclocking protection:
The frequency converter has small and small frequency limiting functions, so that the output frequency can only be within the specified range, thus realizing the overclocking protection function.
11. Stall protection:
Stall protection is generally targeted at synchronous motors. For asynchronous motors, stalling during acceleration will inevitably manifest as overcurrent. The inverter realizes this protection function through overcurrent and overload protection. Stalling during deceleration can be avoided by setting a safe deceleration time during debugging.
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